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Finding the Fourth Proportional to 179.47, 247.69 and 100.80

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Solution

The fourth proportional to 179.47, 247.69 and 100.80 is: 139.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.47 : 247.69 = 100.80 : x
  2. Step 2: Convert to fraction form
    179.47/247.69 = 100.80/x
  3. Step 3: Cross multiply
    179.47x = 247.69 × 100.80
  4. Step 4: Simplify right side
    179.47x = 24,967.15
  5. Step 5: Solve for x
    x = 24,967.15/179.47
  6. Step 6: Final answer
    x = 139.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.